Apparatus for preparing bamboo and kindred material for pulp extraction



1. L. manm APPARATUS FOR PREPARING BAMBOO AND KINDRED MATERIAL FOR PULP EXTRACTION.

APPLICATION FILED MAR. 4,1919.

1,329,973, Patented Feb. 3,1920.

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F/GJ.

JNVENTOR Jflmes L. J'HRDINE;

HTTOA'IYE 5 ARDINE.

APPARATUS FOR PREPARING BAM D KINDRED MATERIAL FOR PULP EXTRACTION. APPLIC 0N FILED MAR. 4. 1919. 1,329,973, Patented Feb. 3,1920.

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' pimu Ill i; mi ED ,sT rEs PATENT. orrion JAME S 'LOCKHART JARDINE, OF 'PENIGU IK, SCOTLAND, ASSIGNOR TO BAMBOO PAPER COMPANY, LIMITED, OF LONDON, ENGLAND, A CORPORATION OF GREAT BRITAINI' APPARATUS FO R. 1 REPARING .T all whom it may concern I 7 Be it knownthat I, J AMES LooKHART J AR-v DINE, a subject of the Kingof Great Britain and Ireland, and a resident of Penicuik, Scotland, have invented certain new and useful Improvements in Apparatus for Preparing Bamboo and 'Kindred Material for Pulp Extraction, and of which the fol- Y lowing is the specification.

The invention relates to apparatus for crushing split bamboo or kindred material preparatory for its converslon into pulp and of the type in which the splitbamboo is passed Yendwise between pairs of rolls, one roll of each palr being grooved or corrugated clrcumferentially and the other smooth surfaced, the position of the rolls beingreversed in each succeeding pa1r,all as described in the specification of the earlier British Patent, No. 14,421 of 1914. I

The invention has for its object to so form and proportion the grooves or corrugations of successive rolls, that the breaking down and crushing of the cane structure is accomplished in a highly effective manner.

According to the invention there is pro vided a considerable number of pairs of rollsthere may for example be asmany as ten. Y Each pair consists of one grooved, or corrugated roll, and one smooth surfaced roll. The pitch and depth of the grooves,

or corrugationsvary progressively from a. maximum at entering end of the range to a m nimum at the leaving end. Thevariation between the greatest and the least is preferably considerableffor example, the pitch and depth of the greatest may be 7 three times that of the least.

. eral continuity of the web, so that it is Specification of Letters Patent. Application filed March 4, 1919. Serial No. 280,571.

As, however, the

BAMBOO AND KINDRED MATERIALVFOIR. PULP EXTRACTION.

finally discharged from the rolls as a mat like hand of tissue;

Therefore preferably the'form of grooving is that of circumferential corrugations that is to say, a series of arcs of circles hav ing their ends joined by'r'eversed'reentrant arcs. Preferably the grooves are relatively shallow in depthtlieir depth may for ex 'amplebe one'quarter of their pitch. By

way of example and as definingbut not limitatively'the' sizcr of the corrugations, the pitch of the greatest maybe 1.25 inches and of the least of a series of tenmay be'0.375

r Patented'Feb.3,1920;

corrugations of these proportions are suitable for dealing With bamboostems with walls from 0.5 t'o'(\625'of an inch thick.

the walls be thinner'the corrugations of the first roll may be lesser, but those of the last shouldv not be decreased.

The positions of the rolls in successive" pairsare reversed, that'is to say, in'onepair 1 the plain roll is above, in the next pair it is below or in like relationship when the rolls are not horizontal.

In the accompanyin drawings Figures 1 to 5 are diagrammatic 'partlal side elevations of a. roll group in which the'rolls are circumferentially grooved or corrugated accordance with my invention.

Figs. '6 and 7 are, respectively, more or less diagrammatic side elevations and plan,

(drawn to a smaller scale) of the arrangement of the rolls in which myiiwentio is illustratively embodied: 1

- Referring to the drawings, it will be noted that each grooved roll A, A A A, A

cumferential grooves are of the same size.

Thus, while there are grooved rolls of five different sizes, there are ten pairs of rolls. Furthermore, as above explained, the pressure on the journals of each succeeding group of roll pairs increases as the size of the grooves diminishes. This I have indicated diagramatically in Fig; 6 by the weights W, l/V W W, W which successively increase in size from the feed end to the discharge end of the range. Of course this pressure on the bearings may be exerted in any desired manner, so long as it is least at the feed end of the range, where the rolls of largest grooves are-situated, and greatest at the discharge end of the range, where the rolls with grooves of least size are arranged. By this construction and arrangement ofthe rolls the split cane is stretched laterally the maximumv amount without penetration or V subdivision of the mass, the cane becoming gradually softer, and its fibers separating and widening into a tissue-like structure or web without destroying the lateral continuity thereof, and is finally discharged from the range as a mat-like hand of cane tissue. p

What I claim is v 1]. In a machine of the type described, a range of roll pairs of like type adapted to crush a materlal such as split bamboo, each roll pair comprising a smooth roll and a cooperating circumferentially grooved roll, the

grooves in the rolls at the feed end of the range being greater in pitch-and depth than those of the rolls at the discharge end of the range, and the range servin tostretch the split cane-into a mat-like 2. In a machine of the type described, a range comprising a series ofgroups of roll pairs of like type adapted to crush a ma- ,terial such as split bamboo, each group having two pairs of rolls, the rolls of one pair being reversed with relation to the rolls of the other pair, and each roll pair throughout the series of groups comprising a smooth roll and a cooperating circumferentially grooved roll, the grooves in the rolls of successive group's'varying in pitch and depth, and those of the group at the feed end of the range being'greater in pitch and depth than those of the rolls of the group at the discharge end, andthe "range serving to stretch the split cane into "a mat-like hand of tissue without destroying the lateral eontinuity of the Web, substantially as described.

3. In a machine of the type described, a

and of tissue without destroying the lateral continuity of I the web, substantially as described.

range of crushing roll pairs arranged in sequence and comprislng pairs having a plain roll and a cooperating circumterentially grooved roll, the grooves of the rolls aetne the feed end of the range being substantially three times the pitch and depth of those of the rolls at the discharge end of the range, and the range serving to crush the ma terial into a mat-like hand of tissue without destroying the lateral continuity of the web, substantially as described.

5. In a construction such as specified in v claim 3, grooved rolls throughout the orange in which thegrooves'are of a depth substan tially one quarter of their width. I

6. In a construction such as specified in claim 3, groovedrolls at. the feedendot V the range having grooves with a pitch of and grooved rolls at the discharge: end of the range having groovesfot apitch of 0.875,

and intermediate grooved rolls with grooves gradually diminishing inpitch; from'the feed to the discharge end of the range. I

7. In a machine of the construction specifie d' in claim 3,'grooved rolls in which the grooves are formed by arcsof ,circlesfjoin'ed i by reverse reentrant arcs, substantially as descrlbed. a; I i

8. In a machine suchas specified'finclaim 3, pressure means for'the cooperating rolls of the range, the pressure upon the rolls at the feed end ofthe range being less than that upon the rolls at the discharge end of the range. I

In testimony whereofI have signed my name tothis specification Y JAMES LOCKHART JARDINE. 

